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Search: id:A061047
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| A061047 |
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Numerator of 1/49 - 1/n^2. |
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+0
20
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| 0, 15, 32, 51, 72, 95, 120, 3, 176, 207, 240, 275, 312, 351, 8, 435, 480, 527, 576, 627, 680, 15, 792, 851, 912, 975, 1040, 1107, 24, 1247, 1320, 1395, 1472, 1551, 1632, 5, 1800, 1887, 1976, 2067, 2160, 2255, 48, 2451, 2552, 2655, 2760, 2867
(list; graph; listen)
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OFFSET
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7,2
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COMMENT
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a(n)=(n+7)^2-49=n*(n+14), except a(7p). Named Hansen-Strong. Comes after Lyman(1906-1914), Balmer(1885), Paschen(1908), Brackett(1922), Pfund(1924), Humphreys(1952 not 1953, justified later). [From Paul Curtz (bpcrtz(AT)free.fr), Oct 07 2008]
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REFERENCES
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Peter Hansen and John Strong, Seventh Series of Atomic Hydrogen, Applied Optics, vol 12, 2, (feb 1973), pp.429-430. [From Paul Curtz (bpcrtz(AT)free.fr), Oct 07 2008]
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CROSSREFS
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Cf. A061035-A061050.
Cf. A061039, A061043, A045944.
Sequence in context: A041448 A157767 A146889 this_sequence A098848 A055809 A007256
Adjacent sequences: A061044 A061045 A061046 this_sequence A061048 A061049 A061050
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KEYWORD
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nonn,frac
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), May 26 2001
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